DIGITAL DITHER
Digital dither can be added to a signal prior to a requantization operation that reduces the number of bits used to represent the signal (example: converting a 24-bit audio signal to a 16-bit representation to be stored in a CD).

Nonsubtractive dither and quantization is shown below:



Why should this be beneficial?

What power level should we set the dither signal to?

What type of dither signal should be used?